How to turn off convection term in Oceananigans model

[RWBY-wiess]

I set up an initial buoyancy field, and considered the change law of the flow velocity in all directions under the action of the buoyancy field. For comparison, I need to ignore the convection term in the N-S equation, but don't know how to turn it off in the model.

[iuryt]

What about setting buoyancy=nothing?
As described in
https://github.com/CliMA/Oceananigans.jl/blob/main/docs/src/model_setup/buoyancy_and_equation_of_state.md#no-buoyancy

If you don't give any value for the buoyancy argument, it is set to nothing as from the example or one-dimensional diffusion.
https://clima.github.io/OceananigansDocumentation/stable/generated/one_dimensional_diffusion/

[RWBY-wiess]

thanks~

[simone-silvestri]

If by convection term you mean momentum advection in the NS, you can turn it off by specifying advection = nothing (in the NonhydrostaticModel) and mometum_advection=nothing (in the HydrostaticFreeSurfaceModel ) and the same to turn it off in the tracer advection-diffusion equation (this time specify tracer_advection=nothing in either model)

otherwise if you want to neglect the hydrostatic pressure effects in the NS equations due to the buoyancy field, @iuryt's solution is good! (take care that if you are using the HydrostaticFreeSurfaceModel the default buoyancy model is based a linear equation of state so you have to specify buoyancy=nothing)

[RWBY-wiess]

thanks~